#### Description <!-- Example: DiarizationPurity does not return the expected value --> #### Steps/Code to Reproduce <!-- Example: ``` from pyannote.core import Annotation, Segment reference = Annotation() reference[Segment(0, 10)] = 'A' reference[Segment(12, 20)] = 'B' reference[Segment(24, 27)] = 'A' reference[Segment(30, 40)] = 'C' hypothesis = Annotation() hypothesis[Segment(2, 13)] = 'a' hypothesis[Segment(13, 14)] = 'd' hypothesis[Segment(14, 20)] = 'b' hypothesis[Segment(22, 38)] = 'c' hypothesis[Segment(38, 40)] = 'd' from pyannote.metrics.diarization import DiarizationPurity purity = DiarizationPurity() print "Purity = {0:.3f}".format(purity(reference, hypothesis)) ``` If the code is too long, feel free to put it in a public gist and link it in the issue: https://gist.github.com --> #### Expected Results <!-- Example: Output should be "Purity = 0.667". Please paste or describe the expected results.--> #### Actual Results <!-- Please paste or specifically describe the actual output or traceback. --> #### Versions <!-- Please paste the output of `pip freeze | grep pyannote` below --> <!-- Thanks for contributing! -->
